Revolving-cutter rotary boring-drill.



together, saidv cutter head having cutter re- 4 vJournaled in In a rotary boring drill, a', head comthe grease through the passages 11 and 11b, is spring and plunger being removable for the purpose -of refilling the chamber l1.

Insteadof having the cutters formedwith' independent bushing pins,

as shown in Fig.

I mayA form the 'cutters' with integral bearing vprojections from opposite sides, as indicated at 4X in Fig. 4, which bearing projections would be surrounded by the sleeves bushings 7x Which, if desired, can be threaded into the recessls formed in the wal-ls of the head sections.

Having thus described claim is:

1. In a rotary .boring drill, a head comprising three sections united on longitudinal lines, said outer sections having their inner faces recessed to form recesses open only at one side' and at the bottom, said -central and outer sections having further recesses to receive cutter journals, and circular cutters said first iny invention what IeCeSSeS.

prising a plurality of sec'tlons Joined on ongitudinal lines and etachably connected ceiving recesses formed in the inner faces of the outer' head sections, said recesses being arranged parallel to the the ,cutter head and each of l ing open only at one side and at the bottom and circular cuttersjournaled therein.

ter-receiving lconnected with ad longitudinal axis of f said'recesses beof sections joined on longitudinal recesses, said recesses each being open only at one side and at the bottom, 'caring pins having their endsfdetachably joining sections, and rotary cutters journaled on said pins. -g

5. n a rotary boring drill, a .head comprising three sections united on longitudinal lines, said outer sections having their` faces recessed to receive cutters, and saidlv central and outer sections having sets of opposed recessesteach of said cutter receiving threaded to engage the recesses in the inner member and theirA outer ends detachably seated in the recesses in the outer` member, and circular cutters rotating on sald bearing pins.

In testimon whereof, I affix my signature 1n presence 'o two w1tnesses.

Witnesses JAMES M. SHEA, BENNErr S. JONES.

CLARENCE E. REED. 

